I've been all over the web to no avail. I've been told there were originally lights in the small holes (see attached) and when I pulled them off the each had a colored filament in them. Anyone know where the bulbs can be bought, I can't find anything on the major parts sites.

https://www.flickr.com/photos/71945287@N03/15015061048/


1955 GMC 100 Series 2